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With complex filters, an output can come from any input, or several inputs, including inputs of a different type. Copying the codec parameters from the first input with the same type does not make any sense. This does not change anything for simple 1->1 filters, as source_index is set in that case.
FFmpeg README ------------- 1) Documentation ---------------- * Read the documentation in the doc/ directory in git. You can also view it online at http://ffmpeg.org/documentation.html 2) Licensing ------------ * See the LICENSE file. 3) Build and Install -------------------- * See the INSTALL file.